Manganese-doped nickel molybdate electrode material and methods for preparing the same
a technology of manganese and molybdate, which is applied in the field of manganese-doped can solve the problems of poor charge-discharge performance, low stability of materials, and limited capacity of existing nickel molybdate and its modified materials to improve the capacity of nickel molybdate, etc., and achieve the effect of improving the electrochemical properties of the nickel molybdate electrode materials
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example 1
[0016]Equal volumes of 0.036 mol / L nickel nitrate solution and 0.004 mol / L manganese chloride solution were mixed thoroughly to form a mixture, followed by adding the same volume of 0.04 mol / L sodium molybdate as the above mixture and transferring thereof into a reactor (the inner lining is Teflon). Reaction temperature was set at 165° C.; reaction time was 9 hours. Next, the reaction product was washed with water for three times, and then dried in a vacuum drying chamber for 12 hours to obtain a Mn-doped NiMoO4 electrode material.
[0017]The specific capacitance of the Mn-doped NiMoO4 electrode material was determined to reach 935.8 F / g under a current density of 0.5 A / g, which significantly improves its performance compared to traditional NiMoO4 materials. Adding Mn would lead to more variations during the redox reaction. Mn has more valence, so more redox reactions would be performed. Meanwhile, XRD result (FIG. 2) showed that the characteristic peaks appearing in the material corr...
example 2
[0021]Equal volumes of 0.0018 mol / L nickel acetate solution and 0.0282 mol / L manganese sulfate solution were mixed thoroughly, followed by adding the same volume of 0.03 mol / L ammonium molybdate as the above mixture and transferring thereof into a reactor (the inner lining is Teflon). Reaction temperature was set at 155° C.; reaction time was 10 hours. Next, the reaction product was washed with water for three times, and then dried at 60° C. in a vacuum drying chamber for 12 hours to obtain a Mn-doped NiMoO4 electrode material.
[0022]The specific capacitance of the NiMoO4 electrode material was determined to be about 862.1 F / g under a current density of 0.5 A / g. Meanwhile, XRD result showed that the characteristic peaks appearing in the material correspond to the standard card of NiMoO4 (PDF #13-0128). However, all peaks were slightly shifted toward the low angle diffraction because of the doping of Mn. In addition, no peaks of other substances appeared in the prepared electrode mate...
example 3
[0024]0.01 mol / L sodium molybdate was added into an equal volume of 0.01 mol / L nickel nitrate solution followed by mixing them thoroughly to form a mixture, and transferring the mixture into a reactor (the inner lining is Teflon). Reaction temperature was set at 165° C.; reaction time was 9 hours. Next, the reaction product was washed with water for three times, and then dried in a vacuum drying chamber for 12 hours to obtain a NiMoO4 electrode material.
[0025]The specific capacitance of the NiMoO4 electrode material was determined to reach 425.7 F / g under a current density of 0.5 A / g. Meanwhile, XRD result showed that the characteristic peaks appearing in the material correspond to the standard card of NiMoO4 (PDF #13-0128).
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